National Monuments As we just mentioned, technically a national monument is a type of national park site. National monuments are usually smaller than national parks. Their purpose is to preserve at least one nationally significant resource, such as Aztec Ruins National Monument, which preserves a 900-year-old ancestral Pueblo Great House in New Mexico. National monuments tend to be places to visit for education and historic remembrance. … [Read more...] about What’s the Difference Between a National Park and National Monument?